JP3006061B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a recording apparatus in which a drive transmission unit of a feeding rotating body for feeding a recording sheet is simplified.

<Prior Art> Today, with the development of information processing systems, various recording devices such as ink jet printers and electronic typewriters are used in offices and the like.

In such a recording apparatus, the feeding roller for feeding the recording sheet is formed into a half-moon shape in cross section, so that the image is disturbed by the back tension after the feeding of the recording sheet, the torque is increased, and the sheet is increased. When the rear end comes off the feed roller, the feed roller is prevented from rotating and feeding the next recording sheet.

However, since the feeding roller has a half-moon cross section, the above problem cannot be solved unless the notch is always stopped at a constant rotation position, and the rotation start position of the arc portion is not constant, There is a possibility that the feed amount of the recording sheet cannot be controlled.

For this reason, as shown in FIG. 13, a feeding gear 51 rotatably and loosely fitted to the feeding roller shaft 50, a clutch drum 52 that rotates integrally with the feeding roller shaft 50 with a pin or the like,
The clutch spring 53 is wound around an adjacent portion for transmitting a driving force from the feed gear 51 to the clutch drum 52, and a control ring 54 is fitted around the outer periphery of the clutch spring 53.

When an engaging portion is provided on the outer periphery of the control ring 54 and is engaged with the lock claw 55, a driving force is not transmitted (OFF) from the feeding gear 51 to the clutch drum 52, and the engaging portion is When the control ring 54 is rotatable by being released from the lock claw 55, the driving force is transmitted (ON).

If the phase of the engagement portion of the control ring 54 and that of the feeding roller are matched, the feeding roller can always be stopped at a constant rotation position.

The lock claw 55 can be released by using a solenoid, not shown, or by projecting a cam-shaped projection on the outer periphery of the control ring 54 and rotating the control ring 54 forward or backward. The cancellation has been performed.

<Problems to be Solved by the Invention> However, in the above-described configuration, there are many components when the driving force is transmitted from the feeding gear 51 to the clutch drum 52, which tends to increase the cost, and the reliability of the device is increased. There was a possibility that the property may be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible for a feeding rotator to feed a recording sheet at a constant feed amount and to return the feeding rotator to an initial rotation position by entraining the feeding rotator by a recording sheet. It is an object of the present invention to provide a recording apparatus capable of stabilizing a feed amount of a recording sheet of a rotating body and realizing simplification of a drive transmission unit of a feeding rotating body.

<Means for Solving the Problems> A typical means according to the present invention for solving the problems includes a circular arc surface for contacting and feeding a recording sheet and a low friction provided on a non-circular surface. A recording rotator having a flange portion disposed in the rotation direction, a movable pressure plate for stacking and supporting the recording sheets, and an urging means for urging the pressure plate toward the feeding rotator. Sheet support means, and a transport rotator disposed downstream of the feed rotator in a sheet feeding direction to transport the recording sheet fed by the feed rotator toward a recording position; A recording unit for recording an image on a recording sheet conveyed at the recording position, a driving unit for separately driving the feed rotator and the transport rotator, and driving the feed rotator. The recording sheet sent out Control means for controlling the driving means so as to stop the feeding rotating body after reaching the body, and subsequently drive the transport rotating body, wherein the feeding rotating body rotates and the circular arc surface On the side where the contact with the recording sheet is started, an extension portion that is continuous with the arc surface is provided on the low friction flange portion, and when the rotation of the feeding rotator is started from the initial phase state, the extension of the flange portion is performed. The recording sheet sequentially comes into contact with the arc surface from the portion, and the feeding of the recording sheet is started by the arc surface, the recording sheet reaches the transport rotating body, the feed rotating body is stopped by the control means, and the transporting is performed. When the rotator is driven, the feed rotator is rotated by the recording sheet being conveyed, and the feed rotator stops in the initial phase state when the low friction flange portion faces the recording sheet. The features.

<Operation> In the above-mentioned means, the recording sheet is always fed to the transport rotary body with a substantially constant feed amount because the arc surface of the feed rotary body comes into contact with the recording sheet and feeding is started. The feeding rotator is rotated by the recording sheet conveyed by the rotator, and returns to the initial position.

Therefore, it is possible to simplify the drive transmission unit to the feed rotating body, and to improve the reliability of sheet conveyance in the recording apparatus at low cost.

<Embodiment> Next, an embodiment of the present invention in which the above means is applied to a serial type bubble jet recording system will be described.

FIG. 1 is an overall perspective view of the recording apparatus, and FIG. 2 is a schematic side view.

(Overall Configuration) First, the overall configuration of the apparatus will be described. A recording sheet 1 serving as a recording medium includes an automatic feeding apparatus (hereinafter, referred to as “ASF”) 11.
The sheet is further fed, and is conveyed to a recording position by a sheet conveying means 2 provided further downstream. At this time, the recording sheet 1 is configured to be pressed by the conveying roller 2a by the sheet pressing member 3 so as not to float from the platen 4.

When the recording sheet 1 is conveyed to the recording position, the carriage 5 is reciprocated along the guide rail 6, and the recording head 7 as a recording unit is driven to record an image on the recording sheet 1, and the recorded image is recorded. The sheet 1 is configured to be discharged to a discharge stacker 8e by a discharge unit 8.

The sheet conveying means 2, the discharging means 8 and the like are driven by a driving motor 9a which is the same driving source. The driving means 9 having the driving motor 9a is connected to one end of the recording apparatus (left side in FIG. 1). Are located in

An ink cartridge 7f for supplying ink to the recording means 7 and a recovery device for removing the ink from the recording head 7 are also provided at one end (left side in FIG. 1) of the recording apparatus. 10 are located.

The driving force of the carriage motor 5c, which is a driving source, is transmitted to the carriage 5 via transmission means (not shown) (pulley, timing belt), and the carriage 5 reciprocates.

Next, the configuration of each unit of the recording apparatus will be specifically described.

(Sheet Conveying Means) The sheet conveying means 2 is for conveying the recording sheet 1 to the recording position, and in this embodiment, as shown in FIG.・ Sheet ・
Feeder) Record sheet fed from 11 or a manual feeder
This is to convey the recording sheet manually fed from 12 or the fan hold paper as the recording sheet 1 fed from the pin-hold tractor 13 for conveying the fan hold paper.

In the sheet conveyance means 2 in this embodiment, the conveyance rollers 2a is a transport rotary member, is driven to rotate in the arrow a direction of FIG. 2, this pinch roller 2b ₁ Before rotated to及後pinch roller 2b ₂ Thus, the recording sheet 1 is conveyed.

The transport roller 2a has both ends on the left and right side walls of the apparatus frame.
14a, is mounted attached to multiple divided rotatably supported roller shaft 2a ₁ to 14b.

Also, the one axial end of the conveyance roller shaft 2a ₁ is not conveying gear 2a ₂ provided, the driving force from the driving motor 9a is transmitted.

The pinch rollers 2b ₁ and 2b ₂ are supported by swingable pinch roller holders 2b ₃ and 2b ₄ , and are pressed against the surface of the transport roller 2a by springs 2c ₁ and 2c ₂ , respectively, and The rotation follows the rotation. Accordingly, the recording sheet 1 by being nipped by the transport roller 2a which rotates the pinch roller 2b _1, 2b _2, the transport force is applied.

Below the transport roller 2a, a paper pan 2d curved along the peripheral surface of the transport roller 2a as shown in FIG.
Is attached. The paper pan 2d extends to the manual feed slot 12, and is configured to serve as a lower guide for the manually fed recording sheet 1.

Further, upper guide plates 15 and 16 are attached above the paper pan 2d at predetermined intervals, and constitute a conveyance path of the recording sheet 1.

A transport path separating plate 17 is provided between the paper pan 2d and the upper guide plate 16, and transports the phon-hold paper fed from the tractor 13 and the recording sheet 1 fed from the ASF 11. The road is divided.

Furthermore in the vicinity of the nip portion between the transport roller 2a and pinch rollers 2b _2, as shown in FIG. 2, the reflection type sensor 2b as a detection means for detecting the recording sheet 1 transported from the transport path ₅ are provided.

In the above configuration, when the transport roller 2a is driven in the direction of the arrow a in FIG. 2 by driving the drive motor 9a, the recording sheet 1 fed from the ASF 11 is moved to the upper guide plate 16, the transport path separating plate 17 and Between the front pinch roller 2b ₁ and the transport roller 2a, and along the peripheral surface of the transport roller 2a, U
Turned, and the rear pinch roller 2b ₂ and transport roller 2
The sheet is nipped by a and conveyed to an upper recording position.

The fan hold paper used as the recording sheet 1 conveyed from the pin feed tractor 13 passes between the paper pan 2d and the conveyance path separation plate 17 and passes through the pinch roller 2b.
₁ and 2b ₂ and the transport roller 2a
Is conveyed to a recording position located above along a U-turn path formed by the paper pan 2d and the upper guide plate 16.

On the other hand, the recording sheet 1 fed from the manual feed port 12 is nipped by the conveying rollers 2a and the rear pinch rollers 2b _2, and is conveyed to the recording position.

If the tip of the fan-hold paper is kept in the conveyance path between the paper pan 2d and the conveyance path separation plate 17 after using the fan hold paper, the recording sheet 1 fed from the ASF 11 is not obstructed. It is not necessary to remove the fan hold paper from the pin feed tractor 13. That is, the feed path of the ASF 11 and the feed path of the fan hold paper are separated, and the configuration is such that it is not necessary to remove the fan hold paper or the ASF 11.

(Sheet pressing member) The sheet pressing member 3 presses the recording sheet 1 conveyed by the conveying unit 2 against the conveying roller 2 to
The recording sheet 1 is prevented from floating from the platen 4.

As shown in FIG. 1, the sheet pressing member 3 is formed as a single plate-like member wider than the moving range of the carriage 5 so as to press the entire width of the recording sheet 1. Each pressing roller 2a
Is pressed against.

The leading end of the sheet pressing member 3 is located below the recording position of the recording means 7 and the conveyed recording sheet 1
Is pressed against the transport roller 2a by the member 3. As a result, the recording sheet 1 at the recording position does not rise from the platen 4.

Further, as described later, the pressing member 3 is configured such that the front end of the carriage 5 always abuts.

(Carriage) The carriage 5 carries the recording means 7 and reciprocates in the width direction of the recording sheet 1.

The carriage 5 is slidably attached to a guide rail 6 having both ends fixed to the left and right side walls 14a and 14b and having a circular cross section, and reciprocates on the guide rail 6 by a carriage motor 5d.

The carriage 5 is rotatably mounted on the guide rail 6 as a center axis, and a portion 5a having a spring property provided on the carriage 5 is pressed against a guide rail 15a provided on the upper guide 15, and the reaction force of the sheet 5 Holding member 3
Is always urged to abut. The part that the carriage 5 contacts is the sheet pressing member 3 and the transport roller 2a.
When the sheet pressing member 3 retreats in the direction of the recording means 7 due to the passage of the recording sheet 1, the carriage 5 similarly retreats in the same direction. Therefore,
The interval between the recording means 7 and the recording sheet 1 is always constant irrespective of the paper thickness, and stable printing quality can be maintained.

The carriage 5 is slidably mounted on a guide rail 6 having both ends fixed to the left and right side walls 14a and 14b and serving as a guide member having a circular cross section. The carriage 5 is rotatably mounted around the guide rail 6 so that the front of the carriage 5, that is, the side facing the recording sheet 1 is lowered forward as shown in FIGS. As a result, the carriage 5 and the recording head 7 mounted on the carriage 5 are urged by the weight of the carriage 5 and come into contact with the carriage front end sheet pressing member 3.

Thereby, the interval between the recording head 7 mounted on the carriage 5 and the recording sheet 1 is always kept constant.

The carriage 5 is connected to a timing belt or the like, which is wound around a pulley (not shown). The carriage 5 reciprocates along the guide rail 6 by driving the carriage motor 5c.

(Recording Unit) The recording unit is the recording sheet 1 conveyed by the conveying unit 2.
The image is recorded in the image. The recording means in this embodiment is configured such that a recording head 7 is mounted on a carriage 5, and the recording is performed by serial scanning of the recording head.

There is an ink jet head as a recording head suitably used in this apparatus. In the ink jet recording system, an orifice (liquid ejection port) for ejecting and ejecting a recording ink liquid as flying droplets, a liquid flow path communicating with the orifice, and a part of the liquid flow path are provided. Discharge energy generating means for applying discharge energy for forming flying liquid droplets in the ink liquid inside. Then, the ejection energy generating means is driven in accordance with the image signal to eject ink droplets and record an image.

As the ejection energy generating means, for example, a method using a pressure energy generating means such as an electromechanical transducer such as a piezo element, an electromagnetic energy generating means for irradiating an ink such as a laser or the like with an ink liquid to generate flying droplets And a method using thermal energy generating means such as an electrothermal converter. Among them, the method using a thermal energy generating means such as an electrothermal converter is preferable because the orifices can be arranged at high density and the recording head can be made compact.

FIG. 8 is an explanatory view of the configuration of the recording head 7 constituting the recording means, and FIGS. 9 (a) to 9 (g) are explanatory views of the principle of bubble jet recording.

In FIG. 8, reference numeral 7a denotes a heater board, on which an electrothermal transducer (discharge heater) 7b on a silicon substrate and an electrode 7c made of aluminum or the like for supplying electric power are formed and disposed. . A top plate 7e having a partition for partitioning a liquid path (nozzle) 7d of the recording liquid is bonded to the heater board 7a. As shown in FIG. 1, an ink cartridge 7f for supplying ink to the recording head 7 is replaceably mounted on the left side of the apparatus.

The ink supplied from the ink cartridge 7f via a conduit (not shown) is supplied to a supply port 7e ₁ provided in a top plate 7e.
The common liquid chamber 7g in the recording head 7 is further filled, and is guided into each nozzle 7d from the common liquid chamber 7g. These nozzles 7d
Formed at a predetermined pitch in the ink discharge ports (orifices) 7d ₁ is formed, also the orifice 7d ₁ is (upper direction of FIG. 8) opposite to the recording sheet 1 sheet conveying direction of the recording head 7 in Have been.

Here, the ink flying principle in the ink jet recording system will be described with reference to FIGS. 9 (a) and 9 (b).

In the steady state, as shown in FIG. 9A, the surface tension and the external pressure of the ink 7h filled in the nozzle 7d are balanced at the orifice surface. When the ink 7h flies in this state, the electric heat converter 7b in the nozzle 7d is energized, and the ink in the nozzle 7d exceeds the nucleate boiling and causes a rapid temperature rise. Then, as shown in FIG. 9 (b), the ink 7h adjacent to the electrothermal converter 7b is heated to generate fine bubbles (bubbles), and the ink in the heated portion is vaporized to cause film boiling. It said bubble 7h ₁ grows rapidly as shown in Figure 9 (c).

Wherein the bubble 7h ₁ is grown up as shown in FIG. 9 (d), an ink droplet is pushed out from the orifice surface of the nozzle 7d. When the ends of the energization of the electrothermal transducer 7b, as shown in FIG. 9 (e), it bubbles 7h ₁ grown contracts is cooled by the ink 7h in the nozzle 7d. The ink droplet flies from the orifice due to the growth and contraction of the bubble. Further, as shown in FIG. 9 (f), the electric heat exchanger 7b
Ink is rapidly cooled in contact with the surface, the bubble 7h ₁ contracts in deposition of negligible or almost eliminated. And when the bubbles 7h ₁ is contracted, the FIG. 9 (g) into the nozzle 7d as shown ink is supplied from the common liquid chamber 7g by a capillary phenomenon, it is intended to prepare for the next energization.

Accordingly, by synchronizing with the movement of the carriage 5 and energizing the electrothermal transducer 7b according to the image signal, the ink image of the recording sheet 1 is recorded.

As shown in FIG. 1, a recovery means 10 is provided at the left end of the moving range of the carriage 5 as described later. The recovery unit 10 has a function of preventing the ink near the orifice surface of the recording head 7 from drying and solidifying due to the ink by covering the ink ejection surface of the recording head 7 at the time of non-recording or the like with the cap 10a. Things.

The recovery means 10 can drive the pump 10d in order to perform defective ejection or removal of the ink or to prevent it, and perform the recovery process by sucking the ink from the orifice surface by the suction force.

(Ejecting Means) The ejecting means 8 is for ejecting the recording sheet 1 recorded by the recording means 7, and ejects the recording sheet 1 upward by an ejection rotating body, and sends the sheet 1 to an ejecting unit. It is configured to accommodate.

In this embodiment, as shown in FIGS. 1 and 2, the recording sheet 1 is discharged by a discharge roller 8a serving as a discharge rotating body and a spur 8b that comes into contact with the discharge roller 8a. A discharge gear 8d is attached to an end of the shaft 8c, and the discharge gear 8d meshes with the intermediate gear 9h.

Accordingly, when the drive motor 9a is driven, the driving force is transmitted to the discharge roller 8a, and the roller 8a rotates, and the recording sheet 1 is discharged upward by the cooperation of the discharge roller 8a and the spur 8b. .

Also, a discharge stacker 8e serving as a discharge unit is provided with the discharge roller 8a.
Is provided on the back side in the rotation direction. This discharge stacker
8e is a lower plate 8e ₁ and upright plate 8e ₂ is constituted by bending the hook-like. Then the lower plate 8e ₁ is disposed so as to be located below a little than the upper end of the discharge roller 8a, the lower end of the discharged recording sheet 1 is supported on the lower plate 8e _1, the sheet back surface is upright plate 8e ₂ , And the discharged recording sheet 1 is configured to stand upright.

Wherein as the upper end of the upright plate 8e ₂ shown in FIG. 2, the tray 8e ₃ is pivotably mounted about an axis 8e _4. When the recording sheet 1 is set on the ASF 11, the tray can be easily set by tilting the tray in the direction of arrow b in FIG.

It is further the part of the upright plate 8e ₂ has protrusions 8f which projects into the discharge roller 8a side as shown in FIGS. 1 and 2 form. The protrusion 8f is located above the discharge roller 8a, and is formed as a ridge extending in the width direction of the recording sheet 1.

When protrusion 8f the upright plate 8e ₂ as the is formed, the recording sheet 1 is discharged by the rotation of the discharge roller 8a sheet below is Seridasa the discharge roller 8a side by the projecting portion 8f. As a result, the rear end of the recording sheet 1 rides on the discharge roller 8a, and is discharged to the discharge stacker 8e with good alignment without buckling.

Here, the protrusion amount for preventing the buckling is 2 to
About 10 mm is preferable.

(ASF) Next, the AS for automatically feeding the recording sheet 1 to the conveying means 2
F11 will be described.

The ASF 11 automatically feeds the recording sheet 1 to the transport roller 2a. In this embodiment, as shown in FIG.
It has a double bin structure composed of a front bin 11a and a rear bin 11b.

Each bin 11a, the 11b, the roller shaft 11a _1, 11b first is supported by the _1, separating roller 11a ₂ is a second feeding roller, 1
1b ₂ is installed. Separating rollers 11a ₂ and 11b ₂
As shown in FIG. 6, a section having a half-moon shape in cross section, and a portion whose outer peripheral surface is not arcuate is a flange portion 11 having low friction.
Ab ₂₁ and 11b ₂₁ are respectively formed. The arcuate surfaces 11a ₂₂ and 11b ₂₂ made of rubber members of the separation rollers 11a ₂ and 11b ₂ are
And it is configured so does not project from the flange portion 11a _21, 11b _21. Thus, the separation roller 11a _2, if the flange portion 11a _21, 11b ₂₁ of 11b ₂ is in the position opposed to the recording sheet 1, the separation roller 11a ₂ on the recording sheet 1, 11b ₂
The arcuate surfaces 11a ₂₂ and 11b ₂₂ do not come into contact with each other.

The pressure plate 11a _3, 11b ₃ of the back side, the plate 11a _3, 11b ₃
The recording sheet 1 stacked thereon is separated from the separation rollers 11a ₂ and 11b.
Press springs 11a ₄ and 11b ₄ are provided to urge the _second side. The downstream vicinity from contact portion between the separation roller 11a _2, 11b ₂ and the pressure plate 11a _3, 11b _3, which separation claw 11a _7, 11b ₇ are respectively provided, stacked on the pressure plate 11a _3, 11b ₃ the recording sheet 1 the uppermost is when fed by含離roller 11a _2, 11b _2, is intended to separate one by one to hold the rest of the recording sheet 1. The separation claws 11 a ₇ and 11 b ₇ are supported so as to be movable in the width direction of the recording sheet 1, and
The outer peripheral surfaces of the flange portions 11a ₂₁ and 11b ₂₁ of a ₂ and 11b ₂
The movement range is restricted within a range that does not come into contact with the upper surface of the recording sheets 1 stacked on the sheets a ₃ and 11b ₃ .

For the roller shafts 11a ₁ and 11b ₁ , for example, a grooved shaft is used, and clutch gears 11a ₅ and 11b ₅ each having a built-in one-way transmission clutch are provided at one end in the axial direction. The driving force is transmitted. The roller shafts 11a ₁ and 11b ₁ may be shafts having a D-shaped cross section.

Further, the separation rollers 11a ₂ and 11b ₂
1a ₁ , 11b ₁ rotates with its roller shafts 11a ₁ , 11b ₁
Are slidably mounted in the axial direction.

The front bin 11a and the rear bin 11b (separation rollers 11a ₂ , 11
Between b ₂ ) and the sheet conveying means 2, there is provided a feeding path 11 f communicating with a conveying path formed by the upper guide plate 16 and the conveying path separating plate 17. At a predetermined position of this feeding path 11f, that is, at a position downstream of the separation rollers 11a ₂ and 11b _{2 and} at an upstream position of the conveyance path, a registration roller is provided.
11c and an upper roller 11d that is in pressure contact with the 11c are provided.
A registration gear 11e is provided at one end in the axial direction of the registration roller 11c, and is configured to transmit a driving force from the driving motor 9a.

The recording sheet 1 separated from the separation rollers 11a ₂ and 11b ₂ and fed from the feeding path 11f comes into contact with a nip portion between a registration roller 11c located downstream thereof and an upper roller 11d pressed against the registration roller 11c. When the registration roller 11c rotates in the direction of the arrow b in FIG. 2, the recording sheet 1 is nipped by the registration roller 11c and the upper roller 11d which is driven to rotate, and is fed to the transport roller 2a of the sheet transport means 2.

Here, the outer peripheral length of the circular arc surface (feedable portion) 11a ₂₂ of the separation roller 11a ₂ is determined from the leading end of the recording sheet 1 stacked on the pressure plate 11a ₃ to the registration roller 11c and the upper roller 11d.
And a length obtained by adding a length corresponding to the length to the pressure contact portion and a certain amount. This fixed length is necessary for rotating the separation roller 11a ₂ by the fed recording sheet 1. In the present embodiment, the length is preferably, for example, about 3 to 10 mm. It is not limited.

The separation roller 11b _2, because they are equipped with a rear bin 11b, length to press-contact portion between the resist roller 11c and the upper roller 11d is longer than the separation roller 11a _2. However, if two rotations of the separation roller 11a ₂ are set to the length from the separation roller 11b ₂ to the pressure contact portion between the registration roller 11c and the upper roller 11d, the separation roller 11a ₂
Since in the second rotation of the b ₂ becomes the same state as the separation roller 11a _2, it can be used isomorphic separation roller.

In this embodiment also, is provided with the resist roller 11c between the separating roller 11a _2, 11b ₂ and the transport rollers 2a, with the configuration that is closer to the separation roller 11a _2, 11b ₂ to the transport rollers 2a, omitted It is also possible.

Also the bottles 11a, the 11b, side guides 11a _6, 11b to the pressure plate 11a _3, 11b ₃ on a bottle 11a, slides in the width direction of 1b
₆ are each equipped. This side guide 11a ₆ , 11b
Numeral ₆ is configured to be slidable in synchronization with the separation rollers 11a ₂ and 11b _2, and can correspond to recording sheets 1 of various sizes.

(Recovery Device) The recovery device 10 includes a cap 10a for capping the ink ejection surface of the recording head 7, a cap carriage 10c for supporting the cap 10a and moving on a guide shaft 10b parallel to the guide rail 6, and The pump 10d generates a negative pressure in the cap 10a and sucks the ink or the like fixed on the ink ejection surface or the like.

When the carriage 5 is moved out of the recording range of the one end side of the recording apparatus, while projections 5b provided on the carriage 5 to hold the cap 10b slidably, protrusion 10c ₁ and the fitting projecting from the cap carriage 10c As a result, the carriage 5 and the cap carriage 10c move integrally.

Behind the cap carriage 10c, a cap 10a
A rail 10e on which a rear portion slides is provided, and the cap 10a is protruded forward with the movement of the cap carriage 10c. Thereby, the carriage 5
Is moved to one end side of the recording apparatus, the cap 10a protrudes forward to cap the ink ejection surface of the recording head 7.

A spring (not shown) is provided between the lower portion of the cap carriage 10c and the left side wall 14a of the recording apparatus, and the cap carriage 10c is constantly urged rightward in FIG.

The pump 10d and the cap 10a are connected by a tube (not shown), and the pump 10d is operated by a pump cam 10h described later.

(Driving means) The driving means 9 is disposed at a position behind the recovery device 10,
The drive force of the drive motor 9a is transmitted to the sheet conveying means 2, the discharge means 8, the ASF 11, and the recovery device 10, and is constituted by the drive motor 9A and a gear transmission mechanism.

The gear transmission mechanism is switched by the carriage 5 when the carriage 5 moves out of a recordable range at one end of the recording apparatus.

3 and 4 show the gear transmission mechanism in detail, and show a drive gear for transmitting the driving force of the drive motor 9a.
9b, a transfer output gear 9c, an ASF output gear 9d, a pump gear 9e, and the like, which are transmission gears that selectively mesh with the drive gear 9b.

The drive gear 9b is attached to the D-shaped non-slide shaft 9b ₁ as a drive shaft so as to be movable only in the axial direction,
Gear 9b ₃ to which a driving force is transmitted via the intermediate gear 9b ₂ from the drive motor 9a in the end of the slide shaft 9b ₁ is fixed. Therefore, when the drive motor 9a is operated, the driving gear 9b rotates together with the slide shaft 9b ₁ by gear 9b _3.

Also the the slide shaft 9b _1, the slide holder 9b ₄ in a manner to sandwich the driving gear 9b is axially supported slidably and rotational. The bottom of the slide holder 9b ₄ is bifurcated projections 9b ₅ is provided, stopped the projection 9b ₅ is around and engaged with the guide rail 9f ₁ frame 9f for supporting the gear transmission mechanism is made on the other hand, the free end of the connecting plate springs 10c ₂ provided in the rear of the gap carriage 10c is engaged.

Therefore, the carriage 5 is moved from the first end of the recording apparatus to the first end.
When the cap carriage 10 is moved in the left-right direction in the drawing,
slide holder 9b ₄ moves in conjunction with the same direction through or c.

That is, the drive gear 9b is slid by the carriage 5 and is the transfer output gear 9c, AS which is a transmission gear.
F output gear 9d, the pump gear 9e is the same number of teeth is set to a pitch circle diameter, are respectively rotatably supported on the support shaft 9g provided on said frame 9f in parallel with said slide shaft 9b ₁ .

Wherein said conveying output gear 9c, the driving gear 9b and a large-diameter gear portion 9c ₁ which meshes, consists diameter gear portion 9c ₂ of the intermediate gear 9h meshes with rotatably mounted on the left side wall 14a I have.

The intermediate gear 9h meshes with the transport gear 2a ₂ and the discharge gear 8d fixed to one axial end of the transport roller 2a,
The small-diameter gear portion 9c ₂ meshes with the registration gear 11e, and when the drive motor 9a is operated at the time when the drive gear 9b meshes with the gear portion 9c ₁ , the conveyance roller 2a, the discharge roller 8a, and the registration roller 11c Rotates forward and reverse.

An ASF input gear 9i provided on the ASF11 side meshes with the ASF output gear 9d, and a drive gear 9b is
When meshed with the output gear 9d, the drive motor 9a drives the AS
The F input gear 9i rotates forward and reverse.

Then the ASF input gear 9i and the clutch gear 11a _5, 11
Between the b _5, as shown in FIG. 5, the intermediate gear 9j, 5k, 9l
Is provided.

The normal rotation ASF output gear 9d by a drive motor 9a (arrow c ₁ direction shown in FIG. 5), this rotation is transmitted to the clutch gear 11a ₅ through ASF input gear 9i, the intermediate gear 9j, arrow c the separation roller 11a ₂ is rotated forward by the clutch gear 11a ₅ which rotates in _one direction, the recording sheet 1 is fed from the front bin 11a. Rotation of this time ASF input gear 9i is also transmitted to the clutch gear 11b ₅ of the rear bottle 11b side, the rotation in the arrow c ₁ direction, the clutch gear 11
wherein the separation roller 11b ₂ is not transmitted by the one-way transmission clutch incorporated in the b _5.

Further, when rotating the ASF output gear 9d in the reverse (arrow c ₂ direction shown in FIG. 5) by the drive motor 9a, the rotation
ASF input gear 9i, intermediate gear 9j, clutch gear 11a _5, the intermediate gear 9k, is transmitted to the clutch gear 11b ₅ through 9l,
The separation roller 11b ₂ is reversed by the clutch gear 11b ₅ which rotates in the arrow c ₂ direction, the recording sheet 1 is fed from the rear bottle 11b. At this time, the rotation of the ASF input gear 9i
Is also transmitted to the clutch gear 11a ₅ of the front bottle 11a side, the rotation in the arrow c ₂ direction, the separating roller 11 by the one-way transmission clutch incorporated in the clutch gear 11a ₅
not transmitted to a _2.

Also, the pump gear 9e is then gear unit 10h ₁ and meshing of the pump cam 10h (see FIG. 1), the driving gear 9b
Meshes with the pump gear 9e, the pump motor 10h is operated by the drive motor 9a, whereby the pump 10d
Operates to perform pumping and the like.

(Control Means) Next, a control means 18 for controlling the driving means 9 includes:
This will be described with reference to the block diagram shown in FIG.

The control unit 18 includes a CPU 18a that controls the entire recording apparatus,
A ROM 18b storing the control contents of the ASF and various data shown in the flowchart shown in FIG. 7, a RAM 18c used as a work area of the CPU 18a, and temporarily storing various data such as the number of recordings, 18d etc.

The drive motor 9a is connected to the interface 18d via a driver 18e.
Is connected to the drive motor 9a, a driver 18f is connected to the recording head 7, a driver 18g is connected to the carriage motor 5c,
Further, the reflection-type sensor 2b ₅ are connected.

Next, a control operation by the control means 18 will be described with reference to a flowchart shown in FIG.

When recording is started, first in step S1, the drive gear 9b is
The switching operation is performed by meshing with the ASF output gear 9d.

Next, the process proceeds to step S2 where the recording sheet 1 is moved to the front bin 11a.
Or from the rear bin 11b. If before feeding from bin 11a of (YES), the process proceeds to step S3, the ASF output gear 9d is rotated in the c ₁ direction (see FIG. 5), the feeding from the rear bottle 11b (NO ) and when the transition to the ASF output gear 9d c ₂ direction (rotationally driven to a reference 5 figure) to step S4. This allows the separation roller 11
By rotating a ₂ and 11b ₂ , the recording sheet 1 is fed from the front bin 11a or the rear bin 1b until the recording sheet 1 comes into contact with the nip portion between the downstream registration roller 11c and the upper roller 11d to form a loop. When the recording sheet 1 is fed,
Extension part 11a formed on low friction flange part 11a21 of 11a2
23 (see FIG. 6), the recording sheet 1 is pushed down without being fed, and the feeding is started after the arc surface 11a22 comes into contact with the upper surface of the recording sheet 1. As a result, even if the stacking amount of the recording sheet 1 is different, the feeding is always started from the same position, and the registration roller 11 is fed with a substantially constant feeding amount.
The skew that occurs when the recording sheet 1 is fed up and the recording sheet 1 is separated and fed can be corrected. At this time, the separation rollers 11a ₂ and 11b ₂ are stationary while the recording sheet 1 is pressed by the arcuate surfaces 11a ₂₂ and 11b ₂₂ , as shown in FIG. 7 (a).

Next, proceeding to step S5, the drive gear 9b is switched to the transport output gear 9c, the transport roller 2a and the registration roller
By rotating the recording sheet 1c forward, the recording sheet 1 is conveyed to a recording position facing the recording head 7. At this time, as shown in FIG. 7 (b), the separation rollers 11a ₂ and 11b ₂ are rotated by the recording sheet 1 so that the flange portions 11a ₂₁ and 11b ₂₁ are rotated by the recording sheet 1.
When rotated to a position facing the
₂₁ and 11a ₂₂ have smaller diameters than the arcuate surfaces 11a ₂₂ and 11b ₂₂ ,
The entrainment ends, and the state returns to the initial phase state.

Then the recording sheet 1 to the recording position by the sensor 2b ₅ goes to step S6 to determine whether or not it has been conveyed. When the recording sheet 1 is detected by the sensor 2b ₅ (ON)
In step S7, the carriage motor 5c is driven to reciprocate the carriage 5, and the recording head 7 is driven to perform recording on the recording sheet 1 according to image information. When recording is completed, the carriage motor
By 5c, the carriage 5 returns to the home position (left end position) shown in FIG.

Next, in step S8, the drive gear 9b is meshed with the transport output gear 9c, and the discharge roller 8a is driven to rotate, thereby discharging the recording sheet 1 after recording to the discharge stacker 8e.

Next, the process proceeds to step S9 to determine whether there is a recording command,
If there is a recording command (YES), the process returns to step S1 to continue the recording operation, and if there is no recording command (NO), the recording operation ends.

In step S6, the sensor 2b ₅ is the case not detect the recording sheet 1 (NO), the process moves to the first recovery sequence of step S10 proceeds. This is because, when the thick recording sheet 1 is separated particularly in a low-temperature, low-humidity environment, slipping on the recording sheet surface of the separation rollers 11a ₂ and 11b ₂ is likely to occur, and the recording sheet 1 does not reach the registration roller 11c. Cases may occur.

Therefore, if the sensor 2b ₅ cannot detect the recording sheet 1 in step S6, the drive gear 9b is again switched to the ASF
And is meshed with the output gear 9d, the c ₁ direction if the feed from the previous bottle 11a, if the feeding from the rear bottle 11b is rotated in the c ₂ direction, the registration roller 11c of the leading end of the recording sheet 1
To reach the nip of the upper roller 11d.

Here, since the separation rollers 11a ₂ and 11b ₂ are slipping on the surface of the recording sheet 1 and are in the state shown in FIG. 7 (a), they can be further fed by the remaining arc surfaces 11a ₂₂ and 11b _22. The feed amount is equivalent to the slip amount. Therefore, the rotation amount of the separation rollers 11a ₂ and 11b _{2 is} the amount to return to the initial phase state (in the case of the front bin 11a, the remaining amount obtained by subtracting the rotation amount in step S3 from one rotation, the rear bin 11b
In the case of, the remaining amount is obtained by subtracting the rotation amount in step S4 from two rotations).

Next, in step S11, the drive gear 9b is switched to the transport output gear 9c, the transport roller 2a and the registration roller 11c are rotated forward to transport the recording sheet 1 to a recording position facing the recording head 7. At this time, since the separation rollers 11a ₂ and 11b ₂ have already returned to the initial phase state, no rotation is caused when the recording sheet 1 is conveyed.

At the next step S12, the recording sheet 1 to the recording position by the sensor 2b ₅ determines whether or not it has been conveyed. If the sensor 2b ₅ is ON, the process returns to step S7 to continue the recording operation. If the sensor 2b ₅ is OFF, the second step after step S13 is performed.
Move to recovery sequence.

In step S13, steps S10 to
This is for reducing the probability of the separation / feeding failure that could not be compensated for by the first recovery sequence shown in S12 by performing the separation / feeding operation again.

Therefore, control operations similar to those in steps S10 to S12 are performed.
That is, when the sensor 2b ₅ cannot detect the recording sheet 1 in step S12, the drive gear 9b is again switched to the ASF
And is meshed with the output gear 9d, the c ₁ direction if the feed from the previous bottle 11a, if the feeding from the rear bottle 11b is rotated in the c ₂ direction, the registration roller 11c of the leading end of the recording sheet 1
To reach the nip of the upper roller 11d.
In this case, since the separation rollers 11a ₂ and 11b ₂ have returned to the initial phase state as shown in FIG. 7 (b), the separation rollers 11a ₂ and 11b ₂ do not have any transport force when the separation rollers 11a ₂ and 11b ₂ rotate. Therefore, the amount of rotation of the separation rollers 11a ₂ and 11b ₂ must be obtained by adding the amount of phase change of the flange portions 11a ₂₁ and 11b _{21 to} the amount of rotation in step S10. That is, the sheet is fed by the separation roller in the initial state, which is a normal feeding operation.

Next, in step S14, the driving gear 9 is switched to the conveyance output gear 9c, the conveyance roller 2a and the registration roller 11c are rotated forward, and the recording sheet 1 is conveyed to the recording position facing the recording head 7.

At the next step S15, the recording sheet 1 to the recording position by the sensor 2b ₅ determines whether or not it has been conveyed. If the sensor 2b ₅ is ON (YES), and continue the recording operation returns to the step S7, step S if OFF (NO)
Move to 16.

In step S16, the first, even after the second recovery sequence, since the sensor 2b ₅ can not detect the recording sheet 1, it determines that the recording sheet 1 is exhausted, a separating roller 11a _2, 11b ₂ Return to the initial phase state.

That is, the driving gear 9b by meshed with the ASF output gear 9d, c in _one direction before long feed from bin 11a, the rear bottle 11b
If the feed from rotating in the c ₂ direction.

Next, the flow shifts to step S17, where an error is displayed as a state of no paper.

Since the separation rollers 11a ₂ and 11b ₂ use a one-way transmission clutch in the drive transmission section, the initial phase state may not be at the position shown in FIG. 7 (b). That is, as shown in FIG. 7 (a), the separation rollers 11a ₂ , 1
There is a possibility that the circular arc surfaces 11a ₂₂ and 11b _{22 of} 1b ₂ are pressed against the recording sheet 1 and come to a standstill. When the feeding operation is started from this state, since the weak flange portion 11a _21, 11b ₂₁ of the conveying force is used to feed the separated and fed recording sheet 1, if the feed amount is insufficient arises.

Therefore, by providing the first recovery sequence, the recording sheet 1 can be reliably transported to the recording position.

Further, according to the second recovery sequence, even if the separation rollers 11a ₂ and 11b ₂ are rotated by the recording sheet 1 and are in any phase position after the first recovery sequence, it is possible to return to the initial phase state. Good feeding operation can be maintained. Therefore, the reliability of the device can be improved at low cost.

[Other embodiments]

 Next, another embodiment of the present invention will be described.

(Sheet conveying means) In the embodiment described above, the conveying rollers 2a and the pinch rollers 2b _1, has been configured to impart conveyance force 2b ₂ to the recording sheet 1, the sheet conveying means 2 is not necessarily roller driving The recording sheet 1 may not be constituted by a sheet-like member, and the conveying force may be applied to the recording sheet 1 by, for example, a rotating belt having a rotatable endless belt.

(Recording Means) As a constitution of the recording means, in addition to the combination of the above-described discharge port, liquid path, and electrothermal converter, US Pat. 59-1 Kaisho
Those disclosed in, for example, Japanese Patent No. 23670 can also be employed.

The above-described recording means has shown an example in which ink is supplied from the ink cartridge 7f mounted on the recording apparatus to the recording head.However, an ink storage chamber is provided in the recording head, and the ink in the ink storage chamber is depleted. In this case, a disposable recording head may be used in which the recording head is replaced.

Further, in the above-described embodiment, the serial recording method is exemplified. However, the present invention is not limited to the serial recording method, and can be applied to a line recording method.

Here, a line type bubble jet recording system capable of full color recording will be briefly described.

In FIG. 12, the recording sheet 1 has an upstream transport roller 19a that is driven and rotated, and pinch rollers 19b and 19c that are driven and rotated by pressing the roller, a downstream transport roller 20a that is driven and rotated, and a driven roller that is pressed against the driven transport roller 20a. It can be conveyed in the direction of arrow d by the pinch roller 20b.

The recording sheet 1 is located between the upstream and downstream transport rollers 19a and 20a.
, Four recording heads 21a, 21b, 21c, 21d
Are arranged in order from the upstream side to the downstream side in the sheet conveying direction. The recording heads 21a to 21d are line-type ink jet recording heads capable of recording over the entire width of the recording sheet 1, and are configured such that ink is supplied from an ink cartridge (not shown) to each of the recording heads 21a to 21d. ing. The recording head 21a has black ink, the recording head 21b has yellow ink, and the recording head 21c.
Magenta ink is supplied to the recording head 21d, and cyan ink is supplied to the recording head 21d.Each of the recording heads 21a to 21d is driven based on a color signal corresponding to the supplied ink color, and ejects ink droplets from nozzles. It is configured.

Accordingly, full-color printing can be performed on the recording sheet 1 by conveying the recording sheet 1 in the direction of arrow d and driving the recording heads 21a to 21d in synchronization with the conveyance.

In FIG. 12, when there is a non-recording nozzle or an unused nozzle below the recording head 21a, the ink ejection port is removed by removing thickened ink or fixed ink from the ink ejection port. A recovery system 22 for performing processing is provided.

When the recovery system 22 performs the recovery process, the recording sheet 1
Alternatively, the recording heads 21a to 21d can be opposed to the respective nozzles. Since the recording heads 21a to 21d perform preliminary heating at appropriate timing, the number of activations of the ejection recovery process is reduced.

Further, the present invention does not need to be limited to the above-described ink jet recording method as a recording means. For example, a so-called thermal transfer recording method in which an ink sheet coated with a heat-meltable ink is heated in accordance with an image signal and the melted ink is transferred to the recording sheet 1, a so-called heating of the recording sheet 1 which develops color by heat in accordance with an image signal. Various recording methods, such as a thermal recording method and a so-called wire dot recording method in which an ink ribbon is hit with a wire in accordance with an image signal to perform recording, can be employed. Accordingly, the recording head is not limited to the above-described bubble jet head, and for example, a thermal head, a wire dot head, a daisy wheel head, or the like can be used.

The recording device may be used as an image output terminal of an information processing device such as a computer.
The present invention can be applied to a copying machine combined with a reader, a facsimile machine having a transmission / reception function, and the like.

<Effects of the Invention> According to the present invention, since the arc surface of the feeding rotating body comes into contact with the recording sheet and the feeding is started, the recording sheet can always be sent to the conveying rotating body with a substantially constant feeding amount. Since the feed rotator is rotated by the recording sheet conveyed by the transport rotator, the feed rotator can be returned to the initial position.

Therefore, it is possible to simplify the drive transmission unit to the feed rotating body, and to improve the reliability of sheet conveyance in the recording apparatus at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view of a serial type ink jet recording apparatus according to one embodiment of the present invention, FIG.
3 and 4 are perspective explanatory views of the driving means, FIG. 5 is an explanatory view showing a driving force transmission structure, FIG. 6 is a cross-sectional explanatory view of a feeding rotating body, and FIGS. ) Is an explanatory view showing the feeding operation, FIG. 8 is an explanatory view of the configuration of the recording head, and FIG. 9 (a).
To (g) are explanatory diagrams of the principle of ink jet recording, FIG. 10 is a block diagram showing a control means, FIG. 11 is a flowchart showing the control operation, FIG. 12 is a configuration explanatory diagram of line type ink jet recording, FIG. Is an explanatory diagram of a conventional technique. 1 is a recording sheet, 2 is a sheet conveying means, 2a is a conveying roller, 2a ₁ is a roller shaft, 2a ₂ is a conveying gear, 2b ₁ , 2b ₂ , 19b, 19
c and 20b are pinch rollers, 2b ₃ and 2b ₄ are pinch roller holders, 2b ₅ is a reflection sensor, 2c ₁ and 2c ₂ are springs, 2d is a paper pan, 3 is a sheet holding member, 4 is a platen, and 5 is a carriage. 5a is a contact portion, 5b is a protrusion, 5c is a carriage motor, 6 is a guide rail, 7 is a recording head, 7a is a heater board, 7b is an electrothermal converter, 7c is an electrode, 7d is a nozzle, 7d
₁ is an orifice, 7e is a top plate, 7e ₁ is a supply port, 7f is an ink cartridge, 7g is a common liquid chamber, 7h is ink, 7h ₁ is a bubble,
8 is a discharge means, 8a is a discharge roller, 8b is a spur, 8c is a roller shaft, 8d is a discharge gear, 8e is a discharge stacker, 8f is a protrusion, 9f
Is a drive means, 9a is a drive motor, 9b is a drive gear, 9b ₁ is a slide shaft, 9b ₂ is an intermediate gear, 9b ₃ is a gear, 9b ₄ is a slide holder, 9b ₅ is a protrusion, 9c transport output gear, 9d is ASF Output gear, 9e is pump gear, 9f is frame, 9g is support shaft, 9h
Is an intermediate gear, 9i is an ASF input gear, 9j, 9k, 9l are intermediate gears, 1
0 is a recovery device, 10a is a cap, 10b is a guide shaft, 10c is a cap carriage, 10c ₁ is a protrusion, 10d is a pump, 10e is a rail, 10f is a spring, 10g is a fixed shutter, 10h is a pump cam, 11 is ASF, 11a. , 11b bin, 11a _1, 11b ₁ are roller shaft, 11a _2, 11b ₂ are a separation roller, 11a _3, 11b ₃ pressure plate, 11a _4, 1
1b ₄ is a pressing spring, 11a ₅ and 11b ₅ are clutch gears, 11
a _6, 11b ₆ are side guides, 11a _7, 11b ₇ separation claw, 11C a resist roller, 11d upper roller, 11e are resist gear, 12
Is a manual feed slot, 13 is a pin feed tractor, 14a and 14b are left and right side walls, 15 and 16 are upper guide plates, 17 is a transport path separating plate, 18 is a control means, 18a is a CPU, 18b is a ROM, 18c is a RAM, 18d Denotes an interface, 19a denotes an upstream conveying roller, 20a denotes a downstream conveying roller, 21a to 21d denote recording heads, and 22 denotes a recovery system.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takashi Nojima 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-60-56580 (JP, A) JP-A-2 JP-A-38229 (JP, A) JP-A-60-67340 (JP, A) JP-A-61-203036 (JP, A) JP-A-60-183440 (JP, A) JP-A-58-60762 (JP, A) ) JP-A-57-64260 (JP, A)

Claims (3)

(57) [Claims] A feed rotator in which an arc surface for feeding the sheet in contact with the recording sheet and a low friction flange provided on the non-arc surface are arranged in the rotation direction; A recording sheet supporting means having a movable pressure plate for supporting and a urging means for urging the pressure plate toward the feeding rotary body; and a recording sheet fed by the feeding rotary body at a recording position. A conveying rotating body disposed downstream of the feeding rotating body in a sheet feeding direction, and a recording unit for recording an image on a recording sheet conveyed at the recording position; Driving means for separately driving the feed rotator and the transport rotator; and stopping the feed rotator after the recording sheet sent by driving the feed rotator reaches the transport rotator. ,
And control means for controlling the driving means so as to drive the transport rotating body. The low friction on the side where the feeding rotating body rotates and the arc surface starts to contact the recording sheet. An extended portion continuous with the arc surface is provided on the flange portion, and when the feeding rotary body starts rotating from the initial phase state, the recording sheet sequentially contacts the arc surface from the extended portion of the flange portion. The feeding of the recording sheet is started by the arc surface, and when the recording sheet reaches the transport rotator and the feed rotator is stopped by the control means and the transport rotator is driven, the recording to be transported is performed. A recording apparatus, wherein the feed rotator is rotated by a sheet, and the feed rotator stops in an initial phase state when the low-friction flange portion faces a recording sheet. 2. The control device according to claim 1, wherein the control unit returns the feeding rotator, which has been stopped during feeding, to an initial phase state in response to a detection signal of a detecting unit that detects a recording sheet conveyed by the conveying rotator. A first recovery sequence to rotate the minute,
2. The recording apparatus according to claim 1, further comprising a second recovery sequence for performing a normal feeding operation. 3. The recording apparatus according to claim 1, wherein said recording means is of an ink jet recording type which performs recording on a recording sheet by discharging ink according to a signal.